Peak Design's 2-in-1 Travel Backpack is as close as I've found to the perfect bag for me. When Peak Design first sent me a sample of the 2-in-1 Travel Backpack to test, I was skeptical. I've tested other versions of Peak Design Travel Backpacks, and none of them really clicked. You could buy the Peak Design 2-in-1 Travel Backpack for $400 or the Travel Backpack 20L and City Backpack 15L for $380 as a combo. That said, if you don't need the modularity features provided by the 2-in-1 Travel Backpack, there are certainly cheaper solutions on the market.